Instrument for m easu rem ents for



(Model.)

y E. L. MILES. INSTRUMENT EOE MEASUEEMENTS EOE SPECTACLES. No. 339,676. Patented Apr. 13, 1886.

FIGA

FIGJI- N. PETERS. Ptmoliumplmr. wnnmglm ne.

'ing is a specification.

limieten diaries FRANKLIN L. MILES, OF E dilIAIl-T7 INDIANA.

lNSTF'UlVlENT FOR MEASUREMENTS FOR SPECTACLES.

SPECIFICATION forming part of Letters Patent No. 339,676, dated April 1 3, 1886.

Application iiled August 1F85.

Z'o all whom 215 may concern:

lle it known that i. FrniNKLlN L. M1 Les, a i citizen of the United States, residing at Ell;A hart, in the county oi' Elkhart and Slate ofi Indiana, have invented a new and useful Im provement in Instruments for Taking Measurements for Spectacles, oi' which the i'ollovf- )Iy improvement relates to an instrument capableof leaking,` all the various measurements required for nianuiacturing,` a pair ci' spenta cles to suit the individual. To this end I mount upon the main bar of the instrument sliding eye-pieces having bows attached in customary manner, sliding, pupillary indexes, preferably ol' the form hereinafter described, and a sliding` nose-piece having` its arch pivoted so as to enable :it to assume any desired angular position` Scales are provided for each ol' these moving,` parts of the instrument, to enable the indicating,` of the various positions assumed by them.

In order that the invention may be fully nndersiood I will proceed to describe it in reference to the nocoinlninying drawings, in whichM Figure Vl is a front elevation of my iinproved instrument. Fig. II is a side eleva tion o1" one oi' the pupillary indexes detached. Fig. lll is a side elevation oi" the nosevpicce. fig. IV is a front elevation oi' the preferred t'orm oi' the instrument.

l represents a bar ol metal, made as shown in Fig. ll or as in Fig. IV, in which former case it is divided at each end into two parts or arms, 2 2".

:3 Il are the eyepieces, to which are hinged the customary bows, l. The eyepieces are provided with arms 5, which surround the bar l,asin Fig. lor thc lowerarms, thereof, as in Fig. I. A. scale, 6, on the said bar l or arm 2 and eyes T in arms 5 enable the asccn taininent of the exact position of the eyepieces. Iupillary indexes S may be employed ordinarily, having arms 9, sliding on the bar l or the upper arm, 2f", thereof, in which latter case a separate scale, 10, is employed, which 'may be viewed through the apertures 1l to` discover the precise position of the index on the scale, and consequently of the axis of the pupil to which the `lens is to be adjusted.

For ordinary use, such an index suffices; but

Serial No. 175,397?. (Modi-l.)

in case it desired to more accuratelysuch axis I employ a disk-shaped index, l2, which is so hinged to the index 8 at i8 or to an arm sliding` On the bar l as to be capable oi' being` readily turned back ont of use. A vertical siot in said disk at lei, just to one side of the index S, and a pivoted wing, l5, adapted to be swung over and thus cover more or less of Said slot, enable the fixing of an exact point for the axis of the pupil. It is obvious that an equivalent oi' this construction would be one in which the wing' l5 is provided with a slot radiating from its pivot 16, which slot by beingl moved over the slot is will present a single restricted aperture of variable height 'for observation.

17 is the nose-piece, bifurcated at bottom and sliding vertically in the bar 1 at center. A setscrcw, 1S, passes through a slot, 19, in the piece 1T, and may be made to hold the saine to any position to which it may be set by a great-cr or less compression of spiral spring 20, placed between said head and the piece or slide 17. A scale, 2l, is employed i'or determining the position assumed by slide 17 on the nose o'l the individual being measured, and the height of the bridge of the spectacles thereby determined. In the bil'urcated arms at the bottom of the slide 17 is pivoted a bridge-piece, 22, which in employing the instrument is made to assume an angle on the nose corresponding to the angle necessary to be given to the bridge of the spectacles, while an upturncd end, 23, oi' said bridge-piece 22 is employed to indicate on scale 2i the exact position assumed by said bridgepiece.

The following;` is the manner of using my device for taking measurements for spectacles: First, the bridge is so adjusted to the nose as to bring` the end ol the index-fingers on the same plane as the pupils. They are then adjusted so as to 'find the exact distance between axes of vision. This in ordinary spectacles gives the position which should be occupied bythe centers of the lenses. The length oi" the bridge-piece depends upon the length oi the horizontal diameters of the lenses. The greater their length the shorter, comparatively, the length of the bridge-piece. Should it be desired to iind the exact dimensions of the lenses or eye-pieces most suitable to any individual, rst vadjust index-fingers to the axes of vision or the pupils, then adjust the external portion of the eye-pieces to the width of the face. The distance then between the index-nger and the external portion of the eye-piece will be one-half of the horizontal diameter of the lenses best adapted to the individual. Having the distance between the pupils and the Width ofthe face or the length of the lenses, the length ofthe nosepiece may be readily ascertained. Again, having adjusted the index-fingers to the pupils, this will give the ordinary lenses the exact position of the eye-pieces and lengt-h of bridge-piece- The eyepieces, on being adjusted concentrically with the pupils, may then be used for trying lenses, or they may be adjusted inwardly or outwardly, so as to ascertain the width of the spectacles. i

Having thus described my invention, the following is what I claim as new therein and desire to secure by Letters Patent:

l. In combination with the bar 1 and movable eye-pieces hung therefrom, the pupillary indexes also hung from said bar and adapted to slide thereon, substantially as set forth.

2. A pupillary index consisting of aslotted disk and a Wing adapted to slide over the slot on said disk, substantially as set forth.

3. In combination with a pupillary indexfinger, a second index of disk form hinged thereto and having slot and pivoted wing, substantially as set forth.

4,. In combination with the main bar l, a nose-piece in the center thereof and a pivoted bridge-piece thereon, substantially asset forth.

5. In combination with a nose-piece, a pivoted bridge-piece thereon carrying an indexnger, and a scale on said nose-piece, over which said index-finger may travel, substan- 4o tially as and for the purpose set forth.

FRANKLIN L. MILES.

Vl-nesses:

E. C. BrcKnL, JOSEPH D. ARNOLD. 

